<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wraper">
            <div class="button">{{this.$store.state.city}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div class="button-wraper" v-for="item of hotCities" :key="item.id">
            <div class="button" @click="handleCityClick(item.name)">{{item.name}}</div>
          </div>                    
        </div>
      </div>
      <div 
        class="area" 
        v-for="(item,key) of cities" 
        :key="key"
        :ref="key"
      >
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list" v-for="innerItem of item" :key="innerItem.id">
          <div class="item border-bottom" @click="handleCityClick(innerItem.name)">{{innerItem.name}}</div>
        </div>                                               
      </div>           
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
export default {
  name: 'CityList',
  props: {
    hotCities: Array,
    cities: Object,
    letter: String
  },
  watch: {
    letter () {
      if(this.letter){
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  },
  methods: {
    handleCityClick (city) {
      // Action通过$store.dispatch触发actions
      this.$store.dispatch('changeCityAction',city)

      // 编程式导航
      this.$router.push('/')
    }
  },
  mounted () {
    // better-scroll 默认会阻止浏览器的原生click事件
    this.scroll = new Bscroll(this.$refs.wrapper,{click:true})
  }
}
</script>

<style lang="stylus" scoped>
  @import "~styles/variable.styl"
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc
  .border-bottom
    &:before
      border-color: #ccc
  .list
    overflow: hidden
    position: absolute
    top: 1.6rem
    left: 0
    right: 0
    bottom: 0
    background:#fff
    .title
      line-height: .54rem
      background: #eee
      padding-left: .2rem
      color: #666
      font-size: .26rem
    .button-list
      overflow: hidden
      padding: .1rem
      .button-wraper
        float:left
        width: 33.33%
        .button
          margin: .1rem
          padding: .1rem 0
          text-align: center
          border: .02rem solid #ccc
          border-radius: .06rem
    .item-list
      .item
        line-height: .76rem
        padding-left: .2rem
</style>
